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U.S. regional changes in twinning rates.

G Allen

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1988
    PubMed
    Summary
    This summary is machine-generated.

    Twinning rates increased across most U.S. regions from 1964-1987, except the Pacific States. Analyzing regional differences in twinning rates may reveal unknown factors influencing multiple births.

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    Area of Science:

    • Reproductive epidemiology
    • Demography

    Background:

    • Twinning rates in the U.S. showed a notable increase between 1964 and 1987.
    • Previous analyses adjusted for maternal age and birth order.

    Purpose of the Study:

    • To examine the geographic distribution of the twinning rate increase.
    • To identify regional variations and consistencies in twinning rates.

    Main Methods:

    • Analysis of U.S. birth data from 1964 to 1987.
    • Geographic division of the U.S. into nine conventional regions.
    • Adjustment of twinning rates for maternal age and birth order.

    Main Results:

    • The rise in twinning rates was observed in all nine geographic divisions, with the exception of the Pacific States.

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  • Rank order analysis revealed differences and consistencies among divisions for both crude and adjusted twinning rates.
  • Demographic parameters also showed variations across divisions.

    • Conclusions:

    • The geographic pattern of increased twinning rates suggests regional factors may be involved.
    • Further investigation into unidentified influences on twinning is warranted, particularly focusing on regional disparities.